The Global Security Institute (GSI) is a largely private (though partly bipartisan^{[clarification needed]}), non-governmental international organization with a mission to eliminate nuclear weapons through international cooperation and security. It aims to influence national laws, seeking to accomplish its mission by focusing on nuclear arms control, non-proliferation, and disarmament.

This article relies excessively on references to primary sources. (January 2012)

The Institute was founded by US Senator Alan Cranston in October 1999. He believed that nuclear weapons are "impractical, unacceptably risky, and unworthy of civilization."^[1][2]

The current leadership of the Institute is as follows:

• Kim Cranston – Chair of the Board, elected in 2000 after the passing of his father
• Jonathan Granoff – President

The Institute currently consists of four well-defined programs:

• Bipartisan Security Group – constituencies include members of the United States Congress and their staff
• Disarmament and Peace Education – constituencies include citizens and leaders in the global community
• Middle Powers Initiative – constituencies include heads of government and diplomats, primarily in Brazil, Egypt, Ireland, Mexico, New Zealand, South Africa, and Sweden
• Parliamentary Network for Nuclear Disarmament – constituencies include legislators around the world